Add gas bomber skill-shot vessel

BuildController.gd

@@ -30,12 +30,12 @@ const VESSEL_DEFINITIONS = preload("res://VesselDefinitions.gd")
 @onready var lab_menu: Control = get_node("../UI/LabMenu")
 @onready var lab_vessel_buttons: Array = [
 	get_node("../UI/LabMenu/VesselA"), get_node("../UI/LabMenu/VesselB"),
-	get_node("../UI/LabMenu/VesselC"),
+	get_node("../UI/LabMenu/VesselC"), get_node("../UI/LabMenu/VesselD"),
 ]
 @onready var lab_vessel_label: Label = get_node("../UI/LabMenu/VesselLabel")
 @onready var lab_vessel_labels: Array = [
 	get_node("../UI/LabMenu/VesselALabel"), get_node("../UI/LabMenu/VesselBLabel"),
-	get_node("../UI/LabMenu/VesselCLabel"),
+	get_node("../UI/LabMenu/VesselCLabel"), get_node("../UI/LabMenu/VesselDLabel"),
 ]
 @onready var lab_detail: Label = get_node("../UI/LabMenu/DetailLabel")
 @onready var lab_status: Label = get_node("../UI/LabMenu/StatusLabel")
@@ -62,18 +62,22 @@ const VESSEL_DEFINITIONS = preload("res://VesselDefinitions.gd")
 @onready var hangar_available_slots: Array = [
 	get_node("../UI/HangarMenu/AvailableInterceptor"),
 	get_node("../UI/HangarMenu/AvailableShield"),
+	get_node("../UI/HangarMenu/AvailableGasBomber"),
 ]
 @onready var hangar_available_labels: Array = [
 	get_node("../UI/HangarMenu/AvailableInterceptorLabel"),
 	get_node("../UI/HangarMenu/AvailableShieldLabel"),
+	get_node("../UI/HangarMenu/AvailableGasBomberLabel"),
 ]
 @onready var hangar_fleet_slots: Array = [
 	get_node("../UI/HangarMenu/FleetInterceptor"),
 	get_node("../UI/HangarMenu/FleetShield"),
+	get_node("../UI/HangarMenu/FleetGasBomber"),
 ]
 @onready var hangar_fleet_labels: Array = [
 	get_node("../UI/HangarMenu/FleetInterceptorLabel"),
 	get_node("../UI/HangarMenu/FleetShieldLabel"),
+	get_node("../UI/HangarMenu/FleetGasBomberLabel"),
 ]
 var build_menu_entries: Array = []
 
@@ -97,11 +101,13 @@ var lab_building_id: int = 0
 @onready var craft_status: Label = get_node("../UI/CraftMenu/StatusLabel")
 @onready var craft_interceptor_label: Label = get_node("../UI/CraftMenu/InterceptorLabel")
 @onready var craft_shield_label: Label = get_node("../UI/CraftMenu/ShieldLabel")
+@onready var craft_gas_bomber_button: IconButton = get_node("../UI/CraftMenu/GasBomberButton")
+@onready var craft_gas_bomber_label: Label = get_node("../UI/CraftMenu/GasBomberLabel")
 @onready var craft_vessel_buttons: Array = [
-	craft_interceptor_button, craft_shield_button,
+	craft_interceptor_button, craft_shield_button, craft_gas_bomber_button,
 ]
 @onready var craft_vessel_labels: Array = [
-	craft_interceptor_label, craft_shield_label,
+	craft_interceptor_label, craft_shield_label, craft_gas_bomber_label,
 ]
 
 # --- the transfer panel (#24) ---------------------------------------------
@@ -723,6 +729,25 @@ func _say(message: String) -> void:
 	_refresh_craft_status()
 
 
+func _format_costs(costs: Dictionary) -> String:
+	var parts: PackedStringArray = PackedStringArray()
+	for resource_type in GameState.resource_types():
+		var amount: int = int(costs.get(resource_type, 0))
+		if amount > 0:
+			parts.append("%d %s" % [amount, GameState.resource_name(resource_type).to_lower()])
+	return " · ".join(parts) if not parts.is_empty() else "free"
+
+
+func _format_missing_costs(costs: Dictionary) -> String:
+	var parts: PackedStringArray = PackedStringArray()
+	for resource_type in GameState.resource_types():
+		var amount: int = int(costs.get(resource_type, 0))
+		if amount > 0:
+			parts.append("%d more %s" % [amount,
+				GameState.resource_name(resource_type).to_lower()])
+	return " · ".join(parts)
+
+
 func _refresh_craft_status() -> void:
 	# Prices live with the buttons they describe. The top of the screen is
 	# intentionally reserved for the shared resource bar and a short action
@@ -732,7 +757,8 @@ func _refresh_craft_status() -> void:
 	for i in range(mini(definitions.size(), craft_vessel_buttons.size())):
 		var definition: Resource = definitions[i]
 		var button: IconButton = craft_vessel_buttons[i]
-		craft_vessel_labels[i].text = "%s\n%d ore" % [definition.display_name, definition.build_cost]
+		craft_vessel_labels[i].text = "%s\n%s" % [definition.display_name,
+			_format_costs(GameState.product_costs(definition.definition_id))]
 		button.icon = definition.icon
 		button.glow_color = definition.glow_color
 		button.enabled = GameState.vessel_is_unlocked(definition.definition_id)
@@ -764,11 +790,10 @@ func _on_craft_vessel(vessel: String) -> void:
 
 
 func _report_order(product: String) -> void:
-	var short: int = GameState.outstanding_cost(craft_building_id)
+	var missing: Dictionary = GameState.outstanding_costs(craft_building_id)
-	if short > 0:
+	if not missing.is_empty():
-		_say("%s queued - %d more ore must be delivered here" % [
+		_say("%s queued - deliver %s here" % [GameState.vessel_name(product),
-			GameState.vessel_name(product), short
+			_format_missing_costs(missing)])
-		])
 	else:
 		_say("%s ordered - building now" % GameState.vessel_name(product))
 
@@ -786,7 +811,8 @@ func _lab_options() -> Array:
 	if not GameState.vessel_is_unlocked(lab_vessel):
 		options.append({"unlock": true, "id": definition.unlock_id,
 			"name": definition.unlock_name, "desc": definition.unlock_description,
-			"cost": definition.unlock_cost, "icon": IconButton.Icon.UPGRADE_UNLOCK_SHIELD})
+			"costs": GameState.research_costs(definition.unlock_id),
+			"icon": definition.unlock_icon if definition.unlock_icon >= 0 else definition.icon})
 		return options
 	for u in GameState.upgrades_for(lab_vessel):
 		options.append({"unlock": false, "id": u.id, "name": u.name, "desc": u.desc})
@@ -819,7 +845,8 @@ func _on_lab_buy() -> void:
 	if not GameState.queue_lab_research(lab_building_id, id):
 		lab_status.text = "Research is already queued or complete"
 		return
-	lab_status.text = "%s queued - deliver ore to this lab" % choice.name
+	lab_status.text = "%s queued - deliver %s to this lab" % [choice.name,
+		_format_costs(GameState.research_costs(id))]
 	_refresh_lab()
 
 
@@ -844,7 +871,8 @@ func _refresh_lab() -> void:
 		if not visible:
 			continue
 		var option: Dictionary = options[i]
-		var price_text: String = "%d ore" % (int(option.cost) if bool(option.unlock) else GameState.upgrade_cost(option.id))
+		var price_text: String = _format_costs(option.costs if bool(option.unlock) \
+			else GameState.research_costs(option.id))
 		if not bool(option.unlock) and GameState.upgrade_maxed(option.id):
 			price_text = "MAX"
 		var level_note: String = "" if bool(option.unlock) else "  %d/%d" % [
@@ -867,7 +895,7 @@ func _refresh_lab() -> void:
 	var queued: Dictionary = GameState.lab_research_order(lab_building_id)
 	lab_buy_button.enabled = queued.is_empty() and (choice.unlock or not GameState.upgrade_maxed(choice.id))
 	if not queued.is_empty():
-		lab_status.text = "%s %d%%" % ["Researching" if bool(queued.started) else "Waiting for ore", int(100.0 * float(queued.elapsed) / maxf(GameState.lab_research_time(), 0.001))]
+		lab_status.text = "%s %d%%" % ["Researching" if bool(queued.started) else "Waiting for resources", int(100.0 * float(queued.elapsed) / maxf(GameState.lab_research_time(), 0.001))]
 	lab_buy_button.queue_redraw()
 
 
@@ -989,7 +1017,7 @@ func _refresh_queue() -> void:
 			int(round(float(head.progress) * 100.0)),
 		]
 	else:
-		queue_detail.text = "%s waiting for ore\nTap to cancel" % \
+		queue_detail.text = "%s waiting for resources\nTap to cancel" % \
 			GameState.vessel_name(String(head.product))
 
 
@@ -1006,7 +1034,7 @@ func _on_queue_slot(index: int) -> void:
 	var refunded: bool = bool(orders[index].started)
 	if not GameState.cancel_order(craft_building_id, index):
 		return
-	_say("%s cancelled%s" % [vessel, "  - ore refunded here" if refunded else ""])
+	_say("%s cancelled%s" % [vessel, "  - resources refunded here" if refunded else ""])
 	_refresh_queue()
 
 

Fleet.gd

@@ -86,6 +86,31 @@ func vessel_types() -> PackedStringArray:
 	return result
 
 
+func has_vessel_type(vessel_type: String) -> bool:
+	for ship in ships:
+		if is_instance_valid(ship) and String(ship.vessel_type) == vessel_type:
+			return true
+	return false
+
+
+func first_vessel_of_type(vessel_type: String) -> Node2D:
+	for ship in ships:
+		if is_instance_valid(ship) and String(ship.vessel_type) == vessel_type:
+			return ship
+	return null
+
+
+func has_capability(capability: String) -> bool:
+	return first_ship_with_capability(capability) != null
+
+
+func first_ship_with_capability(capability: String) -> Node2D:
+	for ship in ships:
+		if is_instance_valid(ship) and ship.has_capability(capability):
+			return ship
+	return null
+
+
 func add_ship(vessel_type: String = GameState.VESSEL_INTERCEPTOR) -> bool:
 	# Adds one vessel in the next free formation slot (bought from a ship
 	# crafter). Returns false when the wedge is already full.

GameController.gd

@@ -21,6 +21,7 @@ extends Node2D
 # Navigation section. Optional so a scene without it still works.
 @onready var pivot_cw_button: IconButton = get_node_or_null("UI/PivotCWButton")
 @onready var pivot_ccw_button: IconButton = get_node_or_null("UI/PivotCCWButton")
+@onready var gas_bomb_controller: GasBombController = get_node_or_null("GasBombController")
 
 var touches: Dictionary = {}
 var pinch_active: bool = false
@@ -252,6 +253,8 @@ func _handle_touch(event: InputEventScreenTouch) -> void:
 	# The joystick gets first refusal on every touch, and only claims ones
 	# that begin inside its own rect - so pinch-to-zoom still works anywhere
 	# else on screen.
+	if gas_bomb_controller != null and gas_bomb_controller.handle_touch(event):
+		return
 	if _handle_pivot_touch(event):
 		return
 	if joystick != null and joystick.visible and joystick.handle_touch(event):
@@ -272,6 +275,8 @@ func _handle_touch(event: InputEventScreenTouch) -> void:
 
 
 func _handle_drag(event: InputEventScreenDrag) -> void:
+	if gas_bomb_controller != null and gas_bomb_controller.handle_drag(event):
+		return
 	if joystick != null and joystick.visible and joystick.handle_drag(event):
 		return
 	if not touches.has(event.index):

GameState.gd

@@ -410,6 +410,7 @@ func building_has_capability(building: Dictionary, capability: String) -> bool:
 # but transporters themselves belong to hubs and are never production orders.
 const VESSEL_INTERCEPTOR: String = "interceptor"
 const VESSEL_SHIELD: String = "shield"
+const VESSEL_GAS_BOMBER: String = "gas_bomber"
 const VESSEL_TRANSPORTER: String = "transporter"
 
 # Compatibility constants for callers and old tests. Runtime metadata is
@@ -501,8 +502,11 @@ func unlock_vessel(vessel: String) -> bool:
 	var definition: Resource = vessel_definition(vessel)
 	if definition == null or definition.unlock_id == "" or vessel_is_unlocked(vessel) or not has_ship_lab():
 		return false
-	if not spend(definition.unlock_cost):
+	var costs: Dictionary = research_costs(definition.unlock_id)
+	if not can_afford_resources(costs):
 		return false
+	for resource_type in costs:
+		bank_inventory.withdraw(String(resource_type), int(costs[resource_type]))
 	vessel_levels[definition.unlock_id] = 1
 	vessel_upgraded.emit(definition.unlock_id)
 	return true
@@ -604,8 +608,16 @@ const PRODUCT_SHIP: String = "interceptor"
 
 
 func product_cost(product: String) -> int:
+	return int(product_costs(product).get(RESOURCE_ORE, 0))
+
+
+func product_costs(product: String) -> Dictionary:
 	var definition: Resource = vessel_definition(product)
-	return definition.build_cost if definition != null else 0
+	if definition == null:
+		return {}
+	if not definition.build_resource_costs.is_empty():
+		return definition.build_resource_costs.duplicate()
+	return {RESOURCE_ORE: definition.build_cost} if definition.build_cost > 0 else {}
 
 
 func can_produce(type: String) -> bool:
@@ -661,34 +673,53 @@ func cancel_order(id: int, index: int) -> bool:
 		return false
 	var order: Dictionary = orders[index]
 	if bool(order.started):
-		_inventory_for_record(b).deposit(RESOURCE_ORE, product_cost(String(order.product)))
+		var inventory: RefCounted = _inventory_for_record(b)
+		var costs: Dictionary = product_costs(String(order.product))
+		for resource_type in costs:
+			inventory.deposit(String(resource_type), int(costs[resource_type]))
 	orders.remove_at(index)
 	return true
 
 
 func outstanding_cost(id: int) -> int:
+	return outstanding_resource_cost(id, RESOURCE_ORE)
+
+
+func outstanding_costs(id: int) -> Dictionary:
+	var result: Dictionary = {}
+	for resource_type in resource_types():
+		var need: int = outstanding_resource_cost(id, resource_type)
+		if need > 0:
+			result[resource_type] = need
+	return result
+
+
+func outstanding_resource_cost(id: int, resource_type: String) -> int:
 	# What this building still needs delivered to clear everything queued.
 	var b: Dictionary = find_building(id)
 	if b.is_empty():
 		return 0
 	var need: int = 0
 	for o in b.get("orders", []):
-		# A started build has already paid, so it is not still owed.
 		if not bool(o.started):
-			need += product_cost(String(o.product))
+			need += int(product_costs(String(o.product)).get(resource_type, 0))
 	for order in b.get("research_orders", []):
 		if not bool(order.started):
-			need += research_cost(String(order.id))
+			need += int(research_costs(String(order.id)).get(resource_type, 0))
-	return maxi(need - _inventory_for_record(b).amount(RESOURCE_ORE), 0)
+	return maxi(need - _inventory_for_record(b).amount(resource_type), 0)
 
 
 func deposit_to_building(id: int, amount: int) -> int:
+	return deposit_resource_to_building(id, RESOURCE_ORE, amount)
+
+
+func deposit_resource_to_building(id: int, resource_type: String, amount: int) -> int:
 	if amount <= 0:
 		return 0
 	var b: Dictionary = find_building(id)
 	if b.is_empty():
 		return 0
-	return _inventory_for_record(b).deposit(RESOURCE_ORE, amount)
+	return _inventory_for_record(b).deposit(resource_type, amount)
 
 
 func queue_order(id: int, product: String = PRODUCT_SHIP) -> bool:
@@ -717,14 +748,20 @@ func _advance_production(delta: float) -> void:
 		# this did before #23) leaves nothing to see or cancel.
 		var order: Dictionary = orders[0]
 		var product: String = String(order.product)
-		var cost: int = product_cost(product)
+		var costs: Dictionary = product_costs(product)
 		var inventory: RefCounted = _inventory_for_record(b)
 		var definition: Resource = vessel_definition(product)
 
 		if not bool(order.started):
-			if inventory.amount(RESOURCE_ORE) < cost:
+			var affordable := true
+			for resource_type in costs:
+				if inventory.amount(String(resource_type)) < int(costs[resource_type]):
+					affordable = false
+					break
+			if not affordable:
 				continue
-			inventory.withdraw(RESOURCE_ORE, cost)
+			for resource_type in costs:
+				inventory.withdraw(String(resource_type), int(costs[resource_type]))
 			order.started = true
 
 		order.elapsed = float(order.elapsed) + delta
@@ -764,8 +801,17 @@ func lab_research_order(lab_id: int) -> Dictionary:
 
 
 func research_cost(id: String) -> int:
+	return int(research_costs(id).get(RESOURCE_ORE, 0))
+
+
+func research_costs(id: String) -> Dictionary:
 	var unlock_definition: Resource = vessel_for_unlock(id)
-	return unlock_definition.unlock_cost if unlock_definition != null else upgrade_cost(id)
+	if unlock_definition != null:
+		if not unlock_definition.unlock_resource_costs.is_empty():
+			return unlock_definition.unlock_resource_costs.duplicate()
+		return {RESOURCE_ORE: unlock_definition.unlock_cost} if unlock_definition.unlock_cost > 0 else {}
+	var cost: int = upgrade_cost(id)
+	return {RESOURCE_ORE: cost} if cost > 0 else {}
 
 
 func _advance_lab_research(delta: float) -> void:
@@ -778,12 +824,18 @@ func _advance_lab_research(delta: float) -> void:
 		var order: Dictionary = orders[0]
 		var id: String = String(order.id)
 		var unlock_definition: Resource = vessel_for_unlock(id)
-		var cost: int = research_cost(id)
+		var costs: Dictionary = research_costs(id)
 		var inventory: RefCounted = _inventory_for_record(lab)
 		if not bool(order.started):
-			if inventory.amount(RESOURCE_ORE) < cost:
+			var affordable := true
+			for resource_type in costs:
+				if inventory.amount(String(resource_type)) < int(costs[resource_type]):
+					affordable = false
+					break
+			if not affordable:
 				continue
-			inventory.withdraw(RESOURCE_ORE, cost)
+			for resource_type in costs:
+				inventory.withdraw(String(resource_type), int(costs[resource_type]))
 			order.started = true
 		order.elapsed = float(order.elapsed) + delta
 		if float(order.elapsed) < lab_research_time():
@@ -1129,7 +1181,13 @@ func _dispatch_transporters() -> void:
 		_begin_leg(chosen_extractor, transporter_position(chosen_extractor), extractor.position,
 			TRANSPORTER_TO_EXTRACTOR)
 	for b in buildings:
-		if outstanding_cost(int(b.id)) <= 0:
+		var needed_resource := ""
+		for resource_type in resource_types():
+			if outstanding_resource_cost(int(b.id), resource_type) > 0 \
+					and bank_inventory.amount(resource_type) > 0:
+				needed_resource = resource_type
+				break
+		if needed_resource == "":
 			continue
 		# One at a time per building: without this every idle transporter
 		# would be sent after the same shortfall and they would all arrive
@@ -1149,6 +1207,7 @@ func _dispatch_transporters() -> void:
 		if chosen.is_empty():
 			return  # every transporter is busy
 		chosen.target_id = int(b.id)
+		chosen.resource_type = needed_resource
 		_begin_leg(chosen, transporter_position(chosen), mothership, TRANSPORTER_TO_MOTHERSHIP)
 
 
@@ -1175,22 +1234,24 @@ func _arrive(t: Dictionary) -> void:
 	match t.state:
 		TRANSPORTER_TO_MOTHERSHIP:
 			var target: Dictionary = find_building(int(t.target_id))
-			var want: int = outstanding_cost(int(t.target_id))
+			var resource_type: String = String(t.get("resource_type", RESOURCE_ORE))
-			var take: int = mini(mini(want, bank_inventory.amount(RESOURCE_ORE)), transporter_load_limit())
+			var want: int = outstanding_resource_cost(int(t.target_id), resource_type)
+			var take: int = mini(mini(want, bank_inventory.amount(resource_type)), transporter_load_limit())
 			if take <= 0 or target.is_empty():
 				# Nothing to carry, or the building is gone. Go home empty.
 				t.target_id = 0
 				_begin_leg(t, here, hub_pos if hub_pos != null else here, TRANSPORTER_RETURNING)
 				return
-			bank_inventory.withdraw(RESOURCE_ORE, take)
+			bank_inventory.withdraw(resource_type, take)
 			t.carrying = take
 			_begin_leg(t, here, target.position, TRANSPORTER_TO_BUILDING)
 		TRANSPORTER_TO_BUILDING:
-			# The ore moves at exactly the moment the vessel arrives.
+			# The cargo moves at exactly the moment the vessel arrives.
-			if deposit_to_building(int(t.target_id), int(t.carrying)) <= 0:
+			var resource_type: String = String(t.get("resource_type", RESOURCE_ORE))
-				# Building demolished in transit - put the ore back rather
+			if deposit_resource_to_building(int(t.target_id), resource_type, int(t.carrying)) <= 0:
+				# Building demolished in transit - put the cargo back rather
 				# than quietly destroying it.
-				bank_inventory.deposit(RESOURCE_ORE, int(t.carrying))
+				bank_inventory.deposit(resource_type, int(t.carrying))
 			t.carrying = 0
 			t.target_id = 0
 			_begin_leg(t, here, hub_pos if hub_pos != null else here, TRANSPORTER_RETURNING)
@@ -1226,6 +1287,13 @@ func can_afford(cost: int) -> bool:
 	return bank_inventory.amount(RESOURCE_ORE) >= cost
 
 
+func can_afford_resources(costs: Dictionary) -> bool:
+	for resource_type in costs:
+		if bank_inventory.amount(String(resource_type)) < int(costs[resource_type]):
+			return false
+	return true
+
+
 func spend(cost: int) -> bool:
 	if not can_afford(cost):
 		return false

GasBombController.gd

@@ -0,0 +1,197 @@
+class_name GasBombController
+extends Node2D
+
+const BOMB_COLOR := Color(0.96, 0.22, 0.72)
+const TARGET_COLOR := Color(0.78, 0.32, 1.0)
+const MAX_RANGE := 950.0
+const AOE_RADIUS := 180.0
+const DRAG_RADIUS := 260.0
+const AIM_DEADZONE := 22.0
+const PROJECTILE_SPEED := 720.0
+const DAMAGE := 3
+const COOLDOWN := 5.0
+
+@export var minimum_zoom: float = 0.4
+@onready var fleet: Node2D = get_node("../Fleet")
+@onready var camera: Camera2D = get_node("../Camera2D")
+@onready var button: IconButton = get_node("../UI/GasBombButton")
+
+var aiming := false
+var aim_touch := -1
+var aim_start_screen := Vector2.ZERO
+var aim_screen := Vector2.ZERO
+var aim_target := Vector2.ZERO
+var saved_zoom := 1.0
+var restoring_zoom := false
+var cooldown_left := 0.0
+
+var projectile_active := false
+var projectile_position := Vector2.ZERO
+var projectile_target := Vector2.ZERO
+var projectile_trail := PackedVector2Array()
+var explosion_time := 0.0
+var explosion_position := Vector2.ZERO
+var last_hit_count := 0
+
+
+func _ready() -> void:
+	button.visible = false
+	queue_redraw()
+
+
+func _process(delta: float) -> void:
+	var was_exploding := explosion_time > 0.0
+	button.visible = fleet.has_capability("gas_bomber")
+	cooldown_left = maxf(cooldown_left - delta, 0.0)
+	button.enabled = cooldown_left <= 0.0
+	if not button.visible and aiming:
+		_cancel_aim()
+
+	if restoring_zoom and not aiming:
+		var z := move_toward(camera.zoom.x, saved_zoom, maxf(saved_zoom, 0.1) * delta * 5.0)
+		camera.zoom = Vector2(z, z)
+		if is_equal_approx(z, saved_zoom):
+			restoring_zoom = false
+
+	if projectile_active:
+		var distance := projectile_position.distance_to(projectile_target)
+		if distance <= PROJECTILE_SPEED * delta:
+			projectile_position = projectile_target
+			projectile_active = false
+			_explode(projectile_target)
+		else:
+			projectile_position = projectile_position.move_toward(projectile_target,
+				PROJECTILE_SPEED * delta)
+		projectile_trail.append(projectile_position)
+		while projectile_trail.size() > 12:
+			projectile_trail.remove_at(0)
+	if explosion_time > 0.0:
+		explosion_time = maxf(explosion_time - delta, 0.0)
+	if aiming or projectile_active or explosion_time > 0.0 or was_exploding:
+		queue_redraw()
+
+
+func can_begin_aim() -> bool:
+	return button.visible and button.enabled and not button._blocked_by_modal() \
+		and not aiming and not projectile_active
+
+
+func handle_touch(event: InputEventScreenTouch) -> bool:
+	if event.pressed:
+		if not can_begin_aim() or not Rect2(button.global_position, button.size).has_point(event.position):
+			return false
+		aiming = true
+		aim_touch = event.index
+		aim_start_screen = event.position
+		aim_screen = event.position
+		saved_zoom = camera.zoom.x
+		restoring_zoom = false
+		button.pressed_down = true
+		button.queue_redraw()
+		_update_aim()
+		return true
+	if event.index != aim_touch:
+		return false
+	var should_fire := aim_start_screen.distance_to(aim_screen) >= AIM_DEADZONE
+	if should_fire:
+		_fire()
+	else:
+		_cancel_aim()
+	return true
+
+
+func handle_drag(event: InputEventScreenDrag) -> bool:
+	if not aiming or event.index != aim_touch:
+		return false
+	aim_screen = event.position
+	_update_aim()
+	return true
+
+
+func _update_aim() -> void:
+	var drag := aim_screen - aim_start_screen
+	var origin: Vector2 = fleet.get_centroid()
+	if drag.length() < 0.001:
+		aim_target = origin
+	else:
+		var distance := minf(drag.length() / DRAG_RADIUS, 1.0) * MAX_RANGE
+		aim_target = origin + drag.normalized() * distance
+	_update_aim_zoom(origin, aim_target)
+	queue_redraw()
+
+
+func _update_aim_zoom(origin: Vector2, target: Vector2) -> void:
+	var displacement := target - origin
+	var half_screen := get_viewport_rect().size * 0.5 - Vector2(54.0, 54.0)
+	var fit_x := saved_zoom if absf(displacement.x) < 1.0 else half_screen.x / (absf(displacement.x) + AOE_RADIUS)
+	var fit_y := saved_zoom if absf(displacement.y) < 1.0 else half_screen.y / (absf(displacement.y) + AOE_RADIUS)
+	var desired := clampf(minf(saved_zoom, minf(fit_x, fit_y)), minimum_zoom, saved_zoom)
+	camera.zoom = Vector2(desired, desired)
+
+
+func _finish_aim() -> void:
+	aiming = false
+	aim_touch = -1
+	button.pressed_down = false
+	button.queue_redraw()
+	restoring_zoom = true
+
+
+func _cancel_aim() -> void:
+	_finish_aim()
+	queue_redraw()
+
+
+func _fire() -> void:
+	var bomber: Node2D = fleet.first_ship_with_capability("gas_bomber")
+	if bomber == null:
+		_cancel_aim()
+		return
+	projectile_active = true
+	projectile_position = bomber.global_position
+	projectile_target = aim_target
+	projectile_trail = PackedVector2Array([projectile_position])
+	cooldown_left = COOLDOWN
+	_finish_aim()
+
+
+func _explode(at: Vector2) -> void:
+	explosion_position = at
+	explosion_time = 0.8
+	last_hit_count = 0
+	for enemy in get_tree().get_nodes_in_group("enemies"):
+		if is_instance_valid(enemy) and enemy is Node2D \
+				and enemy.global_position.distance_to(at) <= AOE_RADIUS:
+			enemy.take_damage(DAMAGE)
+			last_hit_count += 1
+
+
+func _draw() -> void:
+	if aiming:
+		var origin: Vector2 = fleet.get_centroid()
+		NeonDraw.draw_glowing_line(self, origin, aim_target, TARGET_COLOR, 0.7, 0.8)
+		_draw_ring(aim_target, AOE_RADIUS, TARGET_COLOR, 0.8)
+		_draw_ring(aim_target, 18.0, BOMB_COLOR, 1.0)
+	if projectile_trail.size() >= 2 and projectile_active:
+		for i in range(1, projectile_trail.size()):
+			var alpha := float(i) / projectile_trail.size()
+			draw_line(projectile_trail[i - 1], projectile_trail[i],
+				Color(BOMB_COLOR, alpha * 0.65), 4.0 + alpha * 4.0, true)
+	if projectile_active:
+		draw_circle(projectile_position, 12.0, Color(BOMB_COLOR, 0.35))
+		NeonDraw.draw_glowing_circle(self, projectile_position, 7.0, BOMB_COLOR, 1.0)
+	if explosion_time > 0.0:
+		var progress := 1.0 - explosion_time / 0.8
+		var radius := lerpf(24.0, AOE_RADIUS, minf(progress * 1.5, 1.0))
+		draw_circle(explosion_position, radius, Color(BOMB_COLOR, (1.0 - progress) * 0.16))
+		_draw_ring(explosion_position, radius, BOMB_COLOR, 1.0 - progress)
+		for i in range(7):
+			var angle := TAU * float(i) / 7.0 + progress
+			var cloud_at := explosion_position + Vector2(cos(angle), sin(angle)) * radius * 0.55
+			draw_circle(cloud_at, 18.0 + 14.0 * progress, Color(BOMB_COLOR, (1.0 - progress) * 0.22))
+
+
+func _draw_ring(center: Vector2, radius: float, color: Color, alpha: float) -> void:
+	draw_arc(center, radius, 0.0, TAU, 64, Color(color, 0.16 * alpha), 16.0, true)
+	draw_arc(center, radius, 0.0, TAU, 64, Color(color, 0.5 * alpha), 6.0, true)
+	draw_arc(center, radius, 0.0, TAU, 64, Color(1.0, 0.86, 0.96, 0.9 * alpha), 2.0, true)

GasBombController.gd.uid

@@ -0,0 +1 @@
+uid://dj1n53msflyde

GasBomberVesselDefinition.tres

@@ -0,0 +1,26 @@
+[gd_resource type="Resource" script_class="VesselDefinition" load_steps=3 format=3]
+
+[ext_resource type="Script" path="res://VesselDefinition.gd" id="1"]
+[ext_resource type="PackedScene" path="res://VesselGasBomberComponent.tscn" id="2"]
+
+[resource]
+script = ExtResource("1")
+definition_id = "gas_bomber"
+display_name = "Gas Bomber"
+description = "Area-control vessel that launches volatile gas bombs at a manually aimed target."
+build_cost = 10
+build_resource_costs = {"gas": 8, "ore": 10}
+build_time = 18.0
+icon = 31
+glow_color = Color(0.96, 0.32, 0.78, 1)
+hull_points = PackedVector2Array(0, -24, -24, 14, -10, 10, 0, 22, 10, 10, 24, 14)
+fleet_eligible = true
+capabilities = PackedStringArray("gas_bomber")
+component_scenes = Array[PackedScene]([ExtResource("2")])
+base_stats = {"max_speed": 420.0, "acceleration": 400.0, "delivery_speed": 180.0}
+unlock_id = "unlock_gas_bomber"
+unlock_name = "Unlock Gas Bomber"
+unlock_description = "Research volatile-gas containment and unlock the Gas Bomber for ship crafters."
+unlock_cost = 0
+unlock_resource_costs = {"gas": 30}
+unlock_icon = 31

IconButton.gd

@@ -30,6 +30,7 @@ enum Icon {
 	LEFT_ARROW, RIGHT_ARROW,
 	MINUS, PLUS,
 	SHIELD_VESSEL,
+	GAS_BOMBER, GAS_BOMB,
 }
 
 # Size the glyphs were originally drawn against. Every glyph dimension is
@@ -216,6 +217,10 @@ func _draw() -> void:
 			_draw_plus(center, pulse, s)
 		Icon.SHIELD_VESSEL:
 			_draw_shield_vessel(center, pulse, s)
+		Icon.GAS_BOMBER:
+			_draw_gas_bomber(center, pulse, s)
+		Icon.GAS_BOMB:
+			_draw_gas_bomb(center, pulse, s)
 
 
 func _draw_close(center: Vector2, pulse: float, s: float) -> void:
@@ -240,6 +245,27 @@ func _draw_shield_vessel(center: Vector2, pulse: float, s: float) -> void:
 	NeonDraw.draw_glowing_polygon(self, points, _active_color(), pulse, core_color)
 
 
+func _draw_gas_bomber(center: Vector2, pulse: float, s: float) -> void:
+	var hull := PackedVector2Array([
+		center + Vector2(0, -12) * s,
+		center + Vector2(-12, 7) * s,
+		center + Vector2(-5, 5) * s,
+		center + Vector2(0, 11) * s,
+		center + Vector2(5, 5) * s,
+		center + Vector2(12, 7) * s,
+	])
+	NeonDraw.draw_glowing_polygon(self, hull, _active_color(), pulse, core_color)
+	NeonDraw.draw_glowing_circle(self, center + Vector2(0, 2) * s, 4.0 * s,
+		_active_color(), pulse, core_color)
+
+
+func _draw_gas_bomb(center: Vector2, pulse: float, s: float) -> void:
+	NeonDraw.draw_glowing_circle(self, center, 7.0 * s, _active_color(), pulse, core_color)
+	for direction in [Vector2.UP, Vector2.DOWN, Vector2.LEFT, Vector2.RIGHT]:
+		NeonDraw.draw_glowing_circle(self, center + direction * 9.0 * s, 3.5 * s,
+			_active_color(), pulse * 0.85, core_color)
+
+
 func _draw_arrow(center: Vector2, pulse: float, direction: float, s: float) -> void:
 	var r: float = 9.0 * s
 	var tip: Vector2 = center + Vector2(0, r * direction)

Main.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=29 format=3]
+[gd_scene load_steps=30 format=3]
 
 [ext_resource type="Script" path="res://Starfield.gd" id="1"]
 [ext_resource type="Script" path="res://Fleet.gd" id="2"]
@@ -27,6 +27,7 @@
 [ext_resource type="Script" path="res://VesselDeliveryField.gd" id="26"]
 [ext_resource type="Script" path="res://ResourceTransferList.gd" id="27"]
 [ext_resource type="Script" path="res://GasCargoCounter.gd" id="28"]
+[ext_resource type="Script" path="res://GasBombController.gd" id="29"]
 
 [sub_resource type="ShaderMaterial" id="1"]
 shader = ExtResource("5")
@@ -55,6 +56,9 @@ script = ExtResource("1")
 [node name="Fleet" type="Node2D" parent="."]
 script = ExtResource("2")
 
+[node name="GasBombController" type="Node2D" parent="."]
+script = ExtResource("29")
+
 [node name="Camera2D" type="Camera2D" parent="."]
 position = Vector2(0, 0)
 zoom = Vector2(1, 1)
@@ -256,6 +260,21 @@ offset_bottom = -24
 script = ExtResource("10")
 icon = 7
 
+[node name="GasBombButton" type="Control" parent="UI"]
+visible = false
+mouse_filter = 2
+anchor_left = 1.0
+anchor_right = 1.0
+anchor_top = 1.0
+anchor_bottom = 1.0
+offset_left = -172
+offset_right = -24
+offset_top = -344
+offset_bottom = -196
+script = ExtResource("10")
+icon = 32
+glow_color = Color(0.96, 0.22, 0.72, 1)
+
 [node name="PivotCWButton" type="Control" parent="UI"]
 mouse_filter = 2
 anchor_left = 1.0
@@ -788,8 +807,8 @@ horizontal_alignment = 1
 [node name="AvailableInterceptor" type="Control" parent="UI/HangarMenu"]
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -180
+offset_left = -290
-offset_right = -60
+offset_right = -178
 offset_top = 255
 offset_bottom = 375
 script = ExtResource("10")
@@ -799,8 +818,8 @@ icon = 2
 mouse_filter = 2
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -250
+offset_left = -330
-offset_right = 10
+offset_right = -138
 offset_top = 380
 offset_bottom = 460
 theme_override_font_sizes/font_size = 22
@@ -809,8 +828,8 @@ horizontal_alignment = 1
 [node name="AvailableShield" type="Control" parent="UI/HangarMenu"]
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = 60
+offset_left = -56
-offset_right = 180
+offset_right = 56
 offset_top = 255
 offset_bottom = 375
 script = ExtResource("10")
@@ -821,8 +840,30 @@ glow_color = Color(0.45, 0.8, 1, 1)
 mouse_filter = 2
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -10
+offset_left = -96
-offset_right = 250
+offset_right = 96
+offset_top = 380
+offset_bottom = 460
+theme_override_font_sizes/font_size = 22
+horizontal_alignment = 1
+
+[node name="AvailableGasBomber" type="Control" parent="UI/HangarMenu"]
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = 178
+offset_right = 290
+offset_top = 255
+offset_bottom = 375
+script = ExtResource("10")
+icon = 31
+glow_color = Color(0.96, 0.32, 0.78, 1)
+
+[node name="AvailableGasBomberLabel" type="Label" parent="UI/HangarMenu"]
+mouse_filter = 2
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = 138
+offset_right = 330
 offset_top = 380
 offset_bottom = 460
 theme_override_font_sizes/font_size = 22
@@ -840,8 +881,8 @@ horizontal_alignment = 1
 [node name="FleetInterceptor" type="Control" parent="UI/HangarMenu"]
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -180
+offset_left = -290
-offset_right = -60
+offset_right = -178
 offset_top = 565
 offset_bottom = 685
 script = ExtResource("10")
@@ -851,8 +892,8 @@ icon = 2
 mouse_filter = 2
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -250
+offset_left = -330
-offset_right = 10
+offset_right = -138
 offset_top = 690
 offset_bottom = 770
 theme_override_font_sizes/font_size = 22
@@ -861,8 +902,8 @@ horizontal_alignment = 1
 [node name="FleetShield" type="Control" parent="UI/HangarMenu"]
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = 60
+offset_left = -56
-offset_right = 180
+offset_right = 56
 offset_top = 565
 offset_bottom = 685
 script = ExtResource("10")
@@ -873,8 +914,30 @@ glow_color = Color(0.45, 0.8, 1, 1)
 mouse_filter = 2
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -10
+offset_left = -96
-offset_right = 250
+offset_right = 96
+offset_top = 690
+offset_bottom = 770
+theme_override_font_sizes/font_size = 22
+horizontal_alignment = 1
+
+[node name="FleetGasBomber" type="Control" parent="UI/HangarMenu"]
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = 178
+offset_right = 290
+offset_top = 565
+offset_bottom = 685
+script = ExtResource("10")
+icon = 31
+glow_color = Color(0.96, 0.32, 0.78, 1)
+
+[node name="FleetGasBomberLabel" type="Label" parent="UI/HangarMenu"]
+mouse_filter = 2
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = 138
+offset_right = 330
 offset_top = 690
 offset_bottom = 770
 theme_override_font_sizes/font_size = 22
@@ -924,8 +987,8 @@ script = ExtResource("24")
 [node name="VesselA" type="Control" parent="UI/LabMenu"]
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -290
+offset_left = -300
-offset_right = -170
+offset_right = -190
 offset_top = 274
 offset_bottom = 394
 script = ExtResource("10")
@@ -935,8 +998,8 @@ glow_color = Color(0.25, 0.85, 1, 1)
 [node name="VesselB" type="Control" parent="UI/LabMenu"]
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -60
+offset_left = -145
-offset_right = 60
+offset_right = -35
 offset_top = 274
 offset_bottom = 394
 script = ExtResource("10")
@@ -946,8 +1009,19 @@ glow_color = Color(0.45, 0.8, 1, 1)
 [node name="VesselC" type="Control" parent="UI/LabMenu"]
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = 170
+offset_left = 35
-offset_right = 290
+offset_right = 145
+offset_top = 274
+offset_bottom = 394
+script = ExtResource("10")
+icon = 31
+glow_color = Color(0.96, 0.32, 0.78, 1)
+
+[node name="VesselD" type="Control" parent="UI/LabMenu"]
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = 190
+offset_right = 300
 offset_top = 274
 offset_bottom = 394
 script = ExtResource("10")
@@ -971,7 +1045,7 @@ mouse_filter = 2
 anchor_left = 0.5
 anchor_right = 0.5
 offset_left = -330
-offset_right = -130
+offset_right = -160
 offset_top = 400
 offset_bottom = 460
 theme_override_font_sizes/font_size = 22
@@ -982,8 +1056,8 @@ text = "Interceptor"
 mouse_filter = 2
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = -100
+offset_left = -175
-offset_right = 100
+offset_right = -5
 offset_top = 400
 offset_bottom = 460
 theme_override_font_sizes/font_size = 22
@@ -994,7 +1068,19 @@ text = "Shield"
 mouse_filter = 2
 anchor_left = 0.5
 anchor_right = 0.5
-offset_left = 130
+offset_left = 5
+offset_right = 175
+offset_top = 400
+offset_bottom = 460
+theme_override_font_sizes/font_size = 22
+horizontal_alignment = 1
+text = "Gas Bomber"
+
+[node name="VesselDLabel" type="Label" parent="UI/LabMenu"]
+mouse_filter = 2
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = 160
 offset_right = 330
 offset_top = 400
 offset_bottom = 460
@@ -1246,8 +1332,8 @@ anchor_left = 0.5
 anchor_right = 0.5
 anchor_top = 0.5
 anchor_bottom = 0.5
-offset_left = -220
+offset_left = -310
-offset_right = -72
+offset_right = -182
 offset_top = -100
 offset_bottom = 48
 script = ExtResource("10")
@@ -1259,11 +1345,11 @@ anchor_left = 0.5
 anchor_right = 0.5
 anchor_top = 0.5
 anchor_bottom = 0.5
-offset_left = -290
+offset_left = -330
-offset_right = -2
+offset_right = -162
 offset_top = 56
 offset_bottom = 136
-theme_override_font_sizes/font_size = 32
+theme_override_font_sizes/font_size = 24
 text = "Interceptor"
 horizontal_alignment = 1
 
@@ -1272,8 +1358,8 @@ anchor_left = 0.5
 anchor_right = 0.5
 anchor_top = 0.5
 anchor_bottom = 0.5
-offset_left = 72
+offset_left = -148
-offset_right = 220
+offset_right = -20
 offset_top = -100
 offset_bottom = 48
 script = ExtResource("10")
@@ -1286,15 +1372,43 @@ anchor_left = 0.5
 anchor_right = 0.5
 anchor_top = 0.5
 anchor_bottom = 0.5
-offset_left = 2
+offset_left = -168
-offset_right = 290
+offset_right = 0
 offset_top = 56
 offset_bottom = 136
-theme_override_font_sizes/font_size = 32
+theme_override_font_sizes/font_size = 24
 autowrap_mode = 2
 text = "Shield Vessel"
 horizontal_alignment = 1
 
+[node name="GasBomberButton" type="Control" parent="UI/CraftMenu"]
+anchor_left = 0.5
+anchor_right = 0.5
+anchor_top = 0.5
+anchor_bottom = 0.5
+offset_left = 14
+offset_right = 142
+offset_top = -100
+offset_bottom = 28
+script = ExtResource("10")
+icon = 31
+glow_color = Color(0.96, 0.32, 0.78, 1)
+
+[node name="GasBomberLabel" type="Label" parent="UI/CraftMenu"]
+mouse_filter = 2
+anchor_left = 0.5
+anchor_right = 0.5
+anchor_top = 0.5
+anchor_bottom = 0.5
+offset_left = -6
+offset_right = 162
+offset_top = 56
+offset_bottom = 150
+theme_override_font_sizes/font_size = 24
+autowrap_mode = 2
+text = "Gas Bomber"
+horizontal_alignment = 1
+
 [node name="QueueLabel" type="Label" parent="UI/CraftMenu"]
 mouse_filter = 2
 anchor_left = 1.0

NeonDraw.gd

@@ -26,6 +26,16 @@ static func draw_glowing_line(item: CanvasItem, from: Vector2, to: Vector2, glow
 	_draw_layers(item, PackedVector2Array([from, to]), glow_color, pulse, width_scale, core_color)
 
 
+static func draw_glowing_circle(item: CanvasItem, center: Vector2, radius: float,
+		glow_color: Color, pulse: float = 1.0,
+		core_color: Color = DEFAULT_CORE) -> void:
+	var points := PackedVector2Array()
+	for i in range(24):
+		var angle := TAU * float(i) / 24.0
+		points.append(center + Vector2(cos(angle), sin(angle)) * radius)
+	draw_glowing_polygon(item, points, glow_color, pulse, core_color)
+
+
 # An open run of points - unlike draw_glowing_polygon, the ends are NOT
 # joined. For arcs, cradle ribs and other shapes that are deliberately open.
 static func draw_glowing_path(item: CanvasItem, points: PackedVector2Array, glow_color: Color, pulse: float = 1.0, width_scale: float = 1.0, core_color: Color = DEFAULT_CORE) -> void:

PlanetSurface.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=15 format=3]
+[gd_scene load_steps=16 format=3]
 
 [ext_resource type="Script" path="res://GameController.gd" id="1"]
 [ext_resource type="Script" path="res://LunarBackground.gd" id="2"]
@@ -11,6 +11,7 @@
 [ext_resource type="Script" path="res://GasCounter.gd" id="11"]
 [ext_resource type="Script" path="res://CargoCounter.gd" id="12"]
 [ext_resource type="Script" path="res://GasCargoCounter.gd" id="13"]
+[ext_resource type="Script" path="res://GasBombController.gd" id="14"]
 
 [sub_resource type="ShaderMaterial" id="1"]
 shader = ExtResource("3")
@@ -43,6 +44,9 @@ script = ExtResource("4")
 ship_glow_color = Color(0.06, 0.32, 0.5, 1)
 ship_core_color = Color(0.02, 0.09, 0.15, 1)
 
+[node name="GasBombController" type="Node2D" parent="."]
+script = ExtResource("14")
+
 [node name="Camera2D" type="Camera2D" parent="."]
 position = Vector2(0, 0)
 zoom = Vector2(1, 1)
@@ -180,6 +184,22 @@ icon = 7
 glow_color = Color(0.06, 0.32, 0.5, 1)
 core_color = Color(0.02, 0.09, 0.15, 1)
 
+[node name="GasBombButton" type="Control" parent="UI"]
+visible = false
+mouse_filter = 2
+anchor_left = 1.0
+anchor_right = 1.0
+anchor_top = 1.0
+anchor_bottom = 1.0
+offset_left = -172
+offset_right = -24
+offset_top = -344
+offset_bottom = -196
+script = ExtResource("6")
+icon = 32
+glow_color = Color(0.82, 0.08, 0.48, 1)
+core_color = Color(0.02, 0.09, 0.15, 1)
+
 [node name="PivotCWButton" type="Control" parent="UI"]
 mouse_filter = 2
 anchor_left = 1.0

ShieldVesselDefinition.tres

@@ -24,3 +24,4 @@ unlock_id = "unlock_shield"
 unlock_name = "Unlock Shield Vessel"
 unlock_description = "Lets the ship crafter build shield vessels. Its shield absorbs one lethal hit, then cycles back up."
 unlock_cost = 45
+unlock_icon = 23

VesselDefinition.gd

@@ -5,6 +5,7 @@ extends Resource
 @export var display_name: String
 @export_multiline var description: String
 @export var build_cost: int
+@export var build_resource_costs: Dictionary = {}
 @export var build_time: float = 10.0
 @export var icon: int = 2
 @export var glow_color: Color = Color(0.25, 0.85, 1.0)
@@ -21,6 +22,8 @@ extends Resource
 @export var unlock_name: String
 @export_multiline var unlock_description: String
 @export var unlock_cost: int
+@export var unlock_resource_costs: Dictionary = {}
+@export var unlock_icon: int = -1
 
 
 func has_capability(capability: String) -> bool:

VesselDefinitions.gd

@@ -1,10 +1,11 @@
 class_name VesselDefinitions
 extends RefCounted
 
-const ORDER: PackedStringArray = ["interceptor", "shield", "transporter"]
+const ORDER: PackedStringArray = ["interceptor", "shield", "gas_bomber", "transporter"]
 const DEFINITIONS: Dictionary = {
 	"interceptor": preload("res://InterceptorVesselDefinition.tres"),
 	"shield": preload("res://ShieldVesselDefinition.tres"),
+	"gas_bomber": preload("res://GasBomberVesselDefinition.tres"),
 	"transporter": preload("res://TransporterVesselDefinition.tres"),
 }
 

VesselGasBomberComponent.gd

@@ -0,0 +1,3 @@
+extends Node
+
+var capability_id := "gas_bomber"

VesselGasBomberComponent.gd.uid

@@ -0,0 +1 @@
+uid://cim0c4n73qd2j

VesselGasBomberComponent.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://VesselGasBomberComponent.gd" id="1"]
+
+[node name="GasBomberComponent" type="Node"]
+script = ExtResource("1")

tests/_craft_menu_preview.gd

@@ -17,12 +17,19 @@ func _ready() -> void:
 	GameState.fleet_cargo = 24
 	GameState.fleet_gas_cargo = 12
 	GameState.unlocked = ["shipyards", "logistics", "freight"]
+	GameState.vessel_levels["unlock_gas_bomber"] = 1
 	var main: Node = load("res://Main.tscn").instantiate()
 	add_child(main)
+	main.get_node("BackgroundLayer").visible = false
+	main.get_node("Fleet").visible = false
+	main.get_node("AsteroidField").visible = false
+	main.get_node("PlanetField").visible = false
+	main.get_node("BuildingField").visible = false
+	main.get_node("EnemySpawner").set_process(false)
 	main.get_node("BuildingField").place(GameState.BUILDING_SHIP_CRAFTER, Vector2(400.0, 0.0))
 	var crafter_id: int = int(GameState.buildings[-1].id)
 	GameState.deposit_to_building(crafter_id, 42)
-	GameState.find_building(crafter_id).gas_stock = 18
+	GameState.deposit_resource_to_building(crafter_id, GameState.RESOURCE_GAS, 18)
 	var bc: Node = main.get_node("BuildController")
 	bc.craft_building_id = crafter_id
 	# The shared header (#24) is the thing worth eyeballing here, so give it

tests/_gas_bomb_aim_preview.gd

@@ -0,0 +1,38 @@
+extends Node2D
+
+
+func _ready() -> void:
+	GameState.buildings.clear()
+	GameState.extractors.clear()
+	GameState.transporters.clear()
+	GameState.vessel_levels["unlock_gas_bomber"] = 1
+	var main: Node = load("res://Main.tscn").instantiate()
+	add_child(main)
+	main.get_node("BackgroundLayer").visible = false
+	main.get_node("AsteroidField").visible = false
+	main.get_node("PlanetField").visible = false
+	main.get_node("BuildingField").visible = false
+	main.get_node("EnemySpawner").set_process(false)
+	main.get_node("AsteroidField").set_process(false)
+	var fleet: Node = main.get_node("Fleet")
+	fleet.spawn_ships(3, Vector2.ZERO, PackedStringArray([
+		GameState.VESSEL_INTERCEPTOR, GameState.VESSEL_SHIELD,
+		GameState.VESSEL_GAS_BOMBER]))
+	var skill: GasBombController = main.get_node("GasBombController")
+	skill._process(0.0)
+	main.get_node("Camera2D").zoom = Vector2(1.8, 1.8)
+	var button: Control = main.get_node("UI/GasBombButton")
+	var press := InputEventScreenTouch.new()
+	press.index = 9
+	press.position = button.global_position + button.size * 0.5
+	press.pressed = true
+	skill.handle_touch(press)
+	var drag := InputEventScreenDrag.new()
+	drag.index = 9
+	drag.position = press.position + Vector2(-245, -235)
+	skill.handle_drag(drag)
+	for offset in [Vector2(-65, 0), Vector2(45, -45), Vector2(55, 65)]:
+		var enemy: Node = load("res://Enemy.tscn").instantiate()
+		enemy.position = skill.aim_target + offset
+		enemy.speed = 0.0
+		main.add_child(enemy)

tests/_gas_bomb_aim_preview.gd.uid

@@ -0,0 +1 @@
+uid://dcokscjlrguje

tests/_gas_bomb_aim_preview.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://tests/_gas_bomb_aim_preview.gd" id="1"]
+
+[node name="GasBombAimPreview" type="Node2D"]
+script = ExtResource("1")

tests/_hangar_menu_preview.gd

@@ -11,13 +11,19 @@ func _ready() -> void:
 	GameState.stored_vessels = [
 		GameState.VESSEL_INTERCEPTOR,
 		GameState.VESSEL_SHIELD, GameState.VESSEL_SHIELD,
+		GameState.VESSEL_GAS_BOMBER,
 	]
 	var main: Node = load("res://Main.tscn").instantiate()
 	add_child(main)
+	main.get_node("BackgroundLayer").visible = false
+	main.get_node("AsteroidField").visible = false
+	main.get_node("PlanetField").visible = false
+	main.get_node("BuildingField").visible = false
 	main.get_node("AsteroidField").set_process(false)
 	main.get_node("EnemySpawner").set_process(false)
 	main.get_node("Fleet").spawn_ships(3, Vector2.ZERO, PackedStringArray([
 		GameState.VESSEL_INTERCEPTOR, GameState.VESSEL_INTERCEPTOR,
 		GameState.VESSEL_SHIELD,
+		GameState.VESSEL_GAS_BOMBER,
 	]))
 	main.get_node("BuildController")._on_hangar_pressed()

tests/_lab_menu_preview.gd

@@ -16,19 +16,22 @@ func _ready() -> void:
 	GameState.unlocked = ["shipyards", "vessel_science"]
 	var main: Node = load("res://Main.tscn").instantiate()
 	add_child(main)
+	main.get_node("BackgroundLayer").visible = false
+	main.get_node("Fleet").visible = false
+	main.get_node("AsteroidField").visible = false
+	main.get_node("PlanetField").visible = false
+	main.get_node("BuildingField").visible = false
+	main.get_node("EnemySpawner").set_process(false)
 	main.get_node("BuildingField").place(GameState.BUILDING_SHIP_LAB, Vector2(400.0, 0.0))
 	var lab_id: int = int(GameState.buildings[-1].id)
 	GameState.deposit_to_building(lab_id, 18)
 	GameState.fleet_cargo = 12
 	GameState.fleet_gas_cargo = 8
-	# A level already bought, so the list shows both a researched and an
-	# unresearched line rather than a uniform page of zeroes.
-	GameState.vessel_levels["int_damage"] = 1
 	var bc: Node = main.get_node("BuildController")
 	# The shared header (#24) hides its HERE column when it has no building,
 	# so bind it the way opening the panel from the building does.
 	for bar in bc.resource_bars:
 		bar.building_id = lab_id
 	main.get_node("UI/LabMenu").visible = true
-	bc.lab_vessel = GameState.VESSEL_INTERCEPTOR
+	bc.lab_vessel = GameState.VESSEL_GAS_BOMBER
 	bc._refresh_lab()

tests/test_gas_bomber.gd

@@ -0,0 +1,151 @@
+extends SceneTree
+
+var game_state: Node
+var main: Node
+var fleet: Node
+var skill: GasBombController
+var inside_enemies: Array = []
+var outside_enemy: Node
+var stage := 0
+var elapsed := 0.0
+var original_zoom := 2.5
+
+
+func _initialize() -> void:
+	game_state = root.get_node("GameState")
+	game_state.buildings.clear()
+	game_state.extractors.clear()
+	game_state.transporters.clear()
+	game_state.stored_vessels.clear()
+	game_state.vessel_deliveries.clear()
+	game_state.reset_progression()
+	game_state.rocks = 0
+	game_state.gas = 0
+	game_state.fleet_cargo = 0
+	game_state.fleet_gas_cargo = 0
+	game_state.build_time_scale = 0.01
+
+	# Research is gas-only: any amount of ore and 29 gas must still leave it
+	# waiting, then the thirtieth unit starts and completes the unlock.
+	var lab_id: int = game_state.add_building(GameState.BUILDING_SHIP_LAB, Vector2.ZERO)
+	if not game_state.queue_lab_research(lab_id, "unlock_gas_bomber"):
+		_fail_now("could not queue Gas Bomber research")
+		return
+	game_state.deposit_resource_to_building(lab_id, GameState.RESOURCE_ORE, 200)
+	game_state.deposit_resource_to_building(lab_id, GameState.RESOURCE_GAS, 29)
+	game_state._advance_lab_research(10.0)
+	if game_state.outstanding_resource_cost(lab_id, GameState.RESOURCE_GAS) != 1 \
+			or game_state.outstanding_resource_cost(lab_id, GameState.RESOURCE_ORE) != 0:
+		_fail_now("research shortfall was not tracked as gas")
+		return
+	if game_state.vessel_is_unlocked(GameState.VESSEL_GAS_BOMBER):
+		_fail_now("Gas Bomber unlocked without its full gas cost")
+		return
+	game_state.deposit_resource_to_building(lab_id, GameState.RESOURCE_GAS, 1)
+	game_state._advance_lab_research(10.0)
+	if not game_state.vessel_is_unlocked(GameState.VESSEL_GAS_BOMBER):
+		_fail_now("30 gas did not unlock the Gas Bomber")
+		return
+
+	# Crafting requires both resources and preserves the vessel type.
+	var crafter_id: int = game_state.add_building(GameState.BUILDING_SHIP_CRAFTER, Vector2.ZERO)
+	if not game_state.queue_order(crafter_id, GameState.VESSEL_GAS_BOMBER):
+		_fail_now("unlocked Gas Bomber could not be queued")
+		return
+	game_state.deposit_resource_to_building(crafter_id, GameState.RESOURCE_ORE, 10)
+	game_state.deposit_resource_to_building(crafter_id, GameState.RESOURCE_GAS, 7)
+	game_state._advance_production(10.0)
+	if game_state.outstanding_resource_cost(crafter_id, GameState.RESOURCE_GAS) != 1 \
+			or game_state.outstanding_resource_cost(crafter_id, GameState.RESOURCE_ORE) != 0:
+		_fail_now("crafting shortfall was not tracked as gas")
+		return
+	if not game_state.order_list(crafter_id).is_empty() \
+			and bool(game_state.order_list(crafter_id)[0].started):
+		_fail_now("Gas Bomber started with insufficient gas")
+		return
+	game_state.deposit_resource_to_building(crafter_id, GameState.RESOURCE_GAS, 1)
+	game_state._advance_production(10.0)
+	if game_state.stored_vessels != [GameState.VESSEL_GAS_BOMBER]:
+		_fail_now("crafting did not produce a typed Gas Bomber")
+		return
+
+	main = load("res://Main.tscn").instantiate()
+	root.add_child(main)
+	fleet = main.get_node("Fleet")
+	skill = main.get_node("GasBombController")
+
+
+func _process(delta: float) -> bool:
+	elapsed += delta
+	match stage:
+		0:
+			if elapsed < 0.2:
+				return false
+			main.get_node("EnemySpawner").set_process(false)
+			main.get_node("AsteroidField").set_process(false)
+			if main.get_node("UI/GasBombButton").visible:
+				return _fail_now("bomb control appeared without a Gas Bomber")
+			fleet.spawn_ships(2, Vector2.ZERO, PackedStringArray([
+				GameState.VESSEL_INTERCEPTOR, GameState.VESSEL_GAS_BOMBER]))
+			main.get_node("Camera2D").zoom = Vector2(original_zoom, original_zoom)
+			skill._process(0.0)
+			if not main.get_node("UI/GasBombButton").visible:
+				return _fail_now("fleet Gas Bomber did not reveal the bomb control")
+
+			var press := InputEventScreenTouch.new()
+			press.index = 7
+			var bomb_button: Control = main.get_node("UI/GasBombButton")
+			press.position = bomb_button.global_position + bomb_button.size * 0.5
+			press.pressed = true
+			main._handle_touch(press)
+			if not skill.aiming:
+				return _fail_now("bomb control did not begin aiming")
+			var drag := InputEventScreenDrag.new()
+			drag.index = 7
+			drag.position = Vector2(350, 700)
+			main._handle_drag(drag)
+			if main.get_node("Camera2D").zoom.x >= original_zoom:
+				return _fail_now("long aim did not zoom out")
+
+			for offset in [Vector2(-60, 0), Vector2(70, 35)]:
+				var enemy: Node = load("res://Enemy.tscn").instantiate()
+				enemy.position = skill.aim_target + offset
+				enemy.speed = 0.0
+				main.add_child(enemy)
+				inside_enemies.append(enemy)
+			outside_enemy = load("res://Enemy.tscn").instantiate()
+			outside_enemy.position = skill.aim_target + Vector2(GasBombController.AOE_RADIUS + 80.0, 0)
+			outside_enemy.speed = 0.0
+			main.add_child(outside_enemy)
+
+			var release := InputEventScreenTouch.new()
+			release.index = 7
+			release.position = drag.position
+			release.pressed = false
+			main._handle_touch(release)
+			if not skill.projectile_active:
+				return _fail_now("release did not throw a gas bomb")
+			elapsed = 0.0
+			stage = 1
+		1:
+			if elapsed < 2.5:
+				return false
+			if skill.last_hit_count != 2:
+				return _fail_now("AOE hit %d enemies instead of 2" % skill.last_hit_count)
+			for enemy in inside_enemies:
+				if is_instance_valid(enemy):
+					return _fail_now("an enemy inside the AOE survived")
+			if not is_instance_valid(outside_enemy) or outside_enemy.hp != outside_enemy.max_hp:
+				return _fail_now("the AOE damaged an enemy outside its radius")
+			if absf(main.get_node("Camera2D").zoom.x - original_zoom) > 0.03:
+				return _fail_now("camera did not restore its pre-aim zoom")
+			print("TEST_GAS_BOMBER: PASS")
+			quit(0)
+			return true
+	return false
+
+
+func _fail_now(message: String) -> bool:
+	print("TEST_GAS_BOMBER: FAIL (%s)" % message)
+	quit(1)
+	return true

tests/test_gas_bomber.gd.uid

@@ -0,0 +1 @@
+uid://c3vtwrwjpmcbm

tests/test_multi_resource_supply.gd

@@ -0,0 +1,42 @@
+extends SceneTree
+
+
+func _initialize() -> void:
+	var state: Node = root.get_node("GameState")
+	state.buildings.clear()
+	state.extractors.clear()
+	state.transporters.clear()
+	state.stored_vessels.clear()
+	state.reset_progression()
+	state.rocks = 0
+	state.gas = 30
+	state.build_time_scale = 0.01
+
+	state.add_building(GameState.BUILDING_MOTHERSHIP, Vector2.ZERO)
+	state.add_building(GameState.BUILDING_TRANSPORT_HUB, Vector2.ZERO)
+	var lab_id: int = state.add_building(GameState.BUILDING_SHIP_LAB, Vector2(120, 0))
+	if not state.queue_lab_research(lab_id, "unlock_gas_bomber"):
+		_fail("could not queue gas research")
+		return
+	if state.outstanding_resource_cost(lab_id, GameState.RESOURCE_GAS) != 30:
+		_fail("lab did not request 30 gas")
+		return
+
+	# Large steps make each physical leg complete in one call; multiple calls
+	# still exercise dispatch -> bank pickup -> lab delivery -> hub return.
+	for i in range(12):
+		state._advance_transporters(10.0)
+		state._advance_lab_research(10.0)
+	if not state.vessel_is_unlocked(GameState.VESSEL_GAS_BOMBER):
+		_fail("hub transporters did not deliver gas to research")
+		return
+	if state.gas != 0 or state.building_resource(lab_id, GameState.RESOURCE_GAS) != 0:
+		_fail("gas was not consumed at the lab")
+		return
+	print("TEST_MULTI_RESOURCE_SUPPLY: PASS")
+	quit(0)
+
+
+func _fail(message: String) -> void:
+	print("TEST_MULTI_RESOURCE_SUPPLY: FAIL (%s)" % message)
+	quit(1)

tests/test_multi_resource_supply.gd.uid

@@ -0,0 +1 @@
+uid://d34djd8v1r1jd

tests/test_vessel_composition.gd

@@ -23,7 +23,7 @@ func _process(delta: float) -> bool:
 		return false
 	var definitions: Array = VESSEL_DEFINITIONS.all()
 	var fleet_definitions: Array = VESSEL_DEFINITIONS.fleet()
-	if fleet_definitions.size() != 2 \
+	if fleet_definitions.size() != 3 \
 			or fleet_definitions.any(func(definition): return definition.has_capability("transport")):
 		return _fail("logistics transporters leaked into the combat-fleet catalog")
 	if ships.size() != definitions.size():
@@ -45,7 +45,13 @@ func _process(delta: float) -> bool:
 			or definitions[1].hull_points.size() != 6
 			or definitions[1].icon != IconButton.Icon.SHIELD_VESSEL):
 		return _fail("shield vessel is not an unarmed hexagon")
-	if ships[2].has_capability("weapon") or not ships[2].has_capability("transport"):
+	var gas_index: int = VESSEL_DEFINITIONS.ORDER.find(GameState.VESSEL_GAS_BOMBER)
+	if gas_index < 0 or ships[gas_index].has_capability("weapon") \
+			or not ships[gas_index].definition.has_capability("gas_bomber"):
+		return _fail("gas bomber is not an unarmed skill vessel")
+	var transporter_index: int = VESSEL_DEFINITIONS.ORDER.find(GameState.VESSEL_TRANSPORTER)
+	if ships[transporter_index].has_capability("weapon") \
+			or not ships[transporter_index].has_capability("transport"):
 		return _fail("transporter capabilities were composed incorrectly")
 	print("TEST_VESSEL_COMPOSITION: PASS")
 	quit(0)